Navegando por Autor "Souza, Davdson Luiz de"

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    Análise da experimentação química nos livros didáticos do Ensino Médio : adequação segundo os critérios do PNLD e a realidade das Escolas Públicas Estaduais de Maceió
    (Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2022-02-21) Souza, Davdson Luiz de; Ferreira Junior, Jésu Costa; Ferreira, Joacy Vicente; Azevedo, Edmar Marinho; http://lattes.cnpq.br/2213926589443334
    ABSTRACT The present research aims to analyze how the editions of the book "Ser Protagonista - Química" referring to the years 2015 and 2018 of the PNLD, distributed to the High School in public schools, are proposing the experimental activities. For the analysis of the experiments the qualitative research was used in the guides of the textbook of 2015 and 2018 and in the literature. With that, the adequacy and inadequacies of the experiments found in the books were judged and judged as to whether they were mechanical, investigative, their level of dangerousness and materials necessary for the application of the practice. Through the analysis of the results it was verified that some experimental activities present in textbooks do not meet the guidelines of official documents for education. In addition, it was noticed that some experimental activities were not related to the studied content. Not being considered satisfactory in what concerns the promotion of learning in the works analyzed. Thus, we sought to correct the inadequacies through substitutions of reagents and in more unsuitable cases the substitution of the experiment as a whole.
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    Estudo in vitro da atividade e eficácia fotoprotetora de extratos de camapu (Physalis angulata L.)
    (Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2023-11-01) Nascimento, Keliane Francielle dos Santos; Ferreira Júnior, Jésu Costa; http://lattes.cnpq.br/5859354241648167; Queiroz, Stella Freitas de; http://lattes.cnpq.br/5763307109586754; Souza, Davdson Luiz de; http://lattes.cnpq.br/3552801632432486
    Photoprotection aims to reduce skin exposure to ultraviolet (UV) radiation from the sun, helping to combat sunburn, premature aging, and even skin cancer. Sunscreens are substances capable of absorbing, reflecting or refracting UV and thus protecting the skin. The effectiveness of these products is measured through the sun protection factor (SPF), which indicates how much the photoprotective formulation is capable of protecting an individual from this radiation. Currently, the search and use of plant bioactives to protect the skin from the adverse effects of solar radiation has increased significantly, due to the diversity of organic compounds produced by plants, which have the capacity to stabilize free radicals, especially phenolic compounds, which have chromophores in its structure, which promote the absorption of radiation at wavelengths compatible with UV rays, proving suitable for the composition of solar filters, enhancing skin protection. Physalis angulata L. (camapu) belongs to the Solanaceae family and occurs mainly in the North and Northeast regions of Brazil, where it is used in folk medicine as an anti-inflammatory and in the treatment of skin problems. The present work aimed to verify the photoprotective potential of extracts from parts of the camapu plant, and to analyze the FPS behavior of a commercial sunscreen solution “FPS 30” when incorporated with these active ingredients, through in vitro analysis, of the spectrophotometric method. The results obtained demonstrated photoprotective activity of camapu flower and leaf extracts, obtaining FPS values equal to 21.38 and 7.15, respectively, at a concentration of 300 ppm, and allowed us to visualize the effectiveness of the leaf extract as a chemical sunscreen. when it comes to a photoprotective formulation. Therefore, it was concluded that the Physalis Angulata L. leaf extract associated with the photoprotective formulation enhanced the activity of the formulation, increasing its FPS by up to 40.97%, which suggests its indication for use in sunscreens, in addition to reduce production costs, knowing that natural raw materials tend to be cheaper.